Mediaproxy failing due to unknown CA
Spotted this in the wild
Jul 12 18:02:43 colo pleroma: request_id=FbC65R438XBtWakAAFlG [error] Elixir.Pleroma.ReverseProxy: request to "https://media.blendernation.com/wp-content/uploads/2019/07/280RC.jpg" failed: {:tls_alert, {:unknown_ca, 'received CLIENT ALERT: Fatal - Unknown CA'}}
Jul 12 18:06:09 colo pleroma: request_id=FbC7FPsGJjCcXWsAAFVC [error] Elixir.Pleroma.ReverseProxy: request to "https://rixx.de/img/fun-legacy-ip-addresses/header.png" failed: {:tls_alert, {:unknown_ca, 'received CLIENT ALERT: Fatal - Unknown CA'}}
These are LetsEncrypt. Not sure why we're failing at the moment as I'd expect half the fediverse to break here.